The 190 - 420 metre wide asteroid 2006 GX2 will make a close pass (37.4 lunar distances, 0.0960 AU), travelling at 12.85 km/second, to the Earth-Moon system on the 20th March, 2013 @ 03:40 UT ±1 day 02:51.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).